You need to download https://mega.nz/#F!0gREnYCQ!dBuYl9YgMP8r2Diw_BuStg!MlI0VZhAAfter you have moved the img with dd to a sdcard, you can upgrade the linaro os to Ubuntu 16.04.that how it worked with my cubie5.but that was the only way to install a fresh new os. i was not able to install fedora or something like that